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Lic

  1. 1. FILTERS…- PRIYA SRIVASTAVA- 090105801- B.TECH(E.I),III yr.
  2. 2.  A Filter is a circuit that is designed to pass a specified band of frequencies while attenuating all the signals outside that band. It is a frequency selective circuit. The filters are basically classified as active filters & passive filters. Infinite gain multiple feedback active filter
  3. 3.  The passive filter networks use only passive elements such as resistors, inductors and capacitors. The active filter circuits use the active elements such as op- amps, transistors alongwith the passive element. Modern active filters do not use inductors as they are bulky, heavy & non-linear. The inductors generate the stray magnetic fields. They dissipate considerable amount of power.
  4. 4. Four types of filters - “Ideal”lowpass highpassbandpass bandstop
  5. 5. Realistic Filters:lowpass highpassbandpass bandstop
  6. 6.  filter, sometimes called a “brickwall” filter, can be approached by making the order of the filter higher and higher.
  7. 7. Low pass filter High pass C Rfb Rfb C Rin + + Rin + Vin +Vin _ VO _ VO _ _ Band pass filter R1 C2 C1 R2 R fb R1 R2 Ri + Vin _ + VO _
  8. 8. C1 R1 R1 Rfb R2 Ri + C2 +Vin VO _ _

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